Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
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Critical findings
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Potentially Toxic Elements in Foods Consumed in Uganda: Occurrence, Dietary Exposure, and Public Health Risks
2026Gabson Baguma, Gadson Bamanya, Allan Gonzaga, Hannington Twinomuhwezi, Barnabas Mubangizi, Eric Niringiyimana · Pollutants · Uganda
This review synthesized literature on the occurrence of cadmium, chromium, nickel, lead, and arsenic in foods consumed in Uganda. Contamination was concentrated in mining-influenced agricultural areas, wastewater-irrigated farms, municipal dumpsites, industrial corridors, and urban food markets, with vegetables, cereals, livestock products, fish, and street-vended foods exhibiting the greatest contamination burdens. Lead and cadmium most frequently exceeded WHO/FAO, Codex Alimentarius, and Ugandan food safety limits, and children consistently showed higher dietary exposure than adults.
Contamination & food safetyHealthUrban–rural linkageSpider Webs as Biomonitoring Tool for Heavy Metal Pollution in Diverse Environments: A Study in Kochi City
2025M Mohan Joseph, Archana T. Anil · Environmental Quality Management · India (Kochi)
This study evaluated spider webs from Cyrtophora cicatrosa and Pholcus phalangioides as biomonitoring tools for heavy metal pollution in urban, industrial, and semi-urban/agricultural areas of Kochi city, India. Analysis of web samples revealed site-specific variations in Cr, Cu, Mn, Mo, Ni, Pb, Sn, and Zn concentrations, with high levels of Zn found in Eloor (7558 ppm) and Kizhakkambalam (4947.50 ppm). Zn and Sn were the dominant accumulated metals, indicating significant heavy metal contamination in these environments.
Contamination & food safetyHealthUrban–rural linkageUncontrolled urban vegetable farming poses public health risks in Ethiopia
2025Taffere Addis, Sisay Ketema, Abayneh Melaku · Frontiers in Water · Ethiopia (Addis Ababa)
This study in Addis Ababa, Ethiopia, investigated trace metal levels in sediment, soil, and irrigated vegetables from farms along the Akaki River, evaluating public health risks. Sediment levels of arsenic, chromium, copper, nickel, lead, and zinc exceeded threshold effect levels. Soil levels of arsenic, chromium, copper, manganese, and zinc exceeded typical world soil values, with nickel at one site exceeding EEC limits for agricultural soils. Critically, arsenic, lead, and zinc levels in some vegetable samples were above WHO allowable limits, despite soil levels being acceptable, and cadmium was the most accumulated metal in vegetables.
Contamination & food safetyHealthUrban–rural linkagePilotstudie zu urbanem Gärtnern: Schadstoffgehalte in Nahrungspflanzen in Straßennähe/Pilot study on urban gardening: Pollutant levels in food plants near roads
2025Katja Hombrecher · Gefahrstoffe Reinhaltung der Luft · Germany
A pilot study in Germany investigated the impact of road traffic emissions on food plants grown near roads. Bioindicators like kale, chard, Lollo Rosso, and lettuce were exposed for four weeks at four roadside locations and compared to plants in a garden away from roads. While pollutant levels generally did not exceed background or EU maximum limits, significant traffic-related inputs of PAK 4, antimony, aluminum, chromium, and vanadium, and lesser inputs of copper, iron, and lead were detected compared to the control. The findings indicate a potential contamination risk for certain vegetable plants from road traffic.
Contamination & food safetyHealthUrban–rural linkagePortable X-ray fluorescence as a tool for urban soil contamination analysis: accuracy, precision, and practicality
2025E.N. Jenkins, John M. Galbraith, Anna Paltseva · SOIL · Global
This study conducted a literature review of 84 publications to evaluate the accuracy, precision, and practicality of Portable X-ray fluorescence (PXRF) as a tool for analyzing heavy metal contamination in urban soils. Urban soils often face contamination with heavy metals like lead and arsenic, and PXRF was shown to achieve reliable accuracy when properly calibrated. PXRF emerges as a viable method for assessing urban soil contamination.
Contamination & food safetyHealthUrban–rural linkageIdentifying priority control factors for heavy metal pollution in urban agricultural soils of the Chengdu Plain: An integrated multi-model approach
2025M. J. Ni, Shuai Yan, Ting Li, Zijun Zhou, Xiaojing Liu, Shirong Zhang, Guiyin Wang, Xiaoxun Xu, Yulin Pu, Yongxia Jia, Lan Li · Ecotoxicology and Environmental Safety · China (Chengdu)
This study investigated heavy metal (HM) contamination in urban and peri-urban agricultural soils of the Chengdu Plain, China, using an integrated multi-model approach. Four major HM sources were identified, including natural (30.0%), mixed agricultural and transportation (29.5%), metal smelting (19.4%), and atmospheric deposition (21.1%). Risk assessments revealed that Cd and Hg posed the highest ecological risks, and human health risk assessment indicated unacceptable health risks for children, with non-carcinogenic and carcinogenic risk probabilities reaching 4% and 10% respectively.
Contamination & food safetyHealthUrban–rural linkageAssessment of heavy metal pollution on agricultural land in Chengdu city under different anthropogenic pressures based on APCS-MLR modelling
2024Yizhou Peng, Grigorieva Iya Yu · Ecological Indicators · China (Chengdu)
This study assessed heavy metal pollution in rural, urban-rural interface, and urban agricultural lands in Chengdu, China. It found varying degrees of heavy metal pollution across all areas, with arsenic (As) and cadmium (Cd) being the most severe pollutants. Concentrations of As and Cd in soil samples exceeded risk thresholds, and these elements showed high spatial variability, indicating significant anthropogenic influence. Pollution sources included livestock manure, natural sources, agricultural activities, and industrial activities in urban areas.
Contamination & food safetyHealthUrban–rural linkageFood sovereignty & justiceUrban Agriculture & Regional Food Systems Special Section: Improving Livability in Urban Areas: Examining Urban and Peri‐Urban Soil and Plant Management
2024Roberta Bulgari, Erdona Demiraj, Calogero Schillaci, Ahlem Tlili, Yushu Xia · Urban Agriculture & Regional Food Systems · Global
This special issue examines urban and peri-urban soil and plant management, highlighting that soil-related factors in urban agricultural systems pose unique challenges. Issues such as soil fertility, soil biodiversity, and soil contamination require further investigation to enhance urban agriculture's contribution to livability. The issue collects studies supporting sustainable soil management and crop diversification, and explores remote sensing and deep learning for soil health monitoring and plant disease detection related to contamination.
Contamination & food safetyUrban–rural linkageBiodiversityPolicyHealthPesticide residue and dietary intake risk of vegetables grown in Shanghai under modern urban agriculture in 2018–2021
2024Jinrong Tong, Dongsheng Feng, Xia Wang, Min Wang, Mei-Lian Chen, Yanfen Chen, Yingqing Ma, Bo Mei, R. Chen, Mengfeng Gao, Siwen Shen, Hongkang Wang, Weiyi Zhang · Heliyon · China (Shanghai)
A study investigated pesticide residues and dietary intake risk in 7028 vegetable samples grown under modern urban agriculture in Shanghai from 2018 to 2021, analyzing 68 types of pesticides. Pesticide residues were detected in 29.21% of samples, with 0.47% exceeding China's national maximum residue limits (MRLs). The target hazard quotient (THQ) and hazard index (HI) for detected pesticides were all less than 1, suggesting there may be no obvious health hazard for residents.
Contamination & food safetyHealthUrban–rural linkageUrbanisation threats to dairy cattle health: Insights from Greater Bengaluru, India
2023MS Alam, Silpa Mullakkalparambil Velayudhan, Debpriyo Kumar Dey, Chiamaka Adilieme, Pradeep Kumar Malik, Raghavendra Bhatta, Sven König, Eva Schlecht · Tropical Animal Health and Production · India (Bengaluru)
A study in Greater Bengaluru, India, interviewed 151 dairy farmers and analyzed 97 forage samples from 10 lakes and vegetable leftovers to assess urbanization's impact on cattle health. While lake fodder was nutritionally high-quality, 43% of samples contained toxic heavy metals above critical levels. Logit models showed that insufficient drinking water and lake fodder negatively impacted cattle health, despite 60% of farmers believing their cows were healthy.
Contamination & food safetyHealthUrban–rural linkageFood lossHeavy metal occurrence within urban agriculture practices in eastern zones of Nairobi city
2023Njenga John Ng’ang’a, Mukundi John Bosco, Masinde Peter Wasike, Kihurani Agnes Wanjiru · Journal of Agriculture Science and Technology · Kenya (Nairobi)
A study in Nairobi's eastern zone assessed heavy metal occurrence in urban farm inputs and food crops (tomatoes, arrowroots, kales). Cadmium, manganese, lead, and zinc concentrations were analyzed in soil, water, and crop samples. The study found that heavy metal contents, particularly cadmium, manganese, lead, and zinc, were above allowable limits in several crops, and based on FAO/WHO standards, were high for health concern.
Contamination & food safetyHealthUrban–rural linkageDAMPAK PERUBAHAN PENGGUNAAN LAHAN BAGI PERTANIAN PERKOTAAN DI KAPANEWON KASIHAN
2022Adam Abraham · Jurnal Riset Daerah · Indonesia
This study aimed to identify the impacts of land use change experienced by urban farmers in Kapanewon Kasihan, Indonesia. Using a deductive-qualitative approach, it was analyzed that urban development has both positive and negative impacts on farmers. The most significant negative impacts included pollution, decreased productivity, and the squeezing of urban agricultural land, which could lead to long-term environmental quality degradation and further spread of land use change.
Contamination & food safetyUrban–rural linkagePolicyEconomicsPotential Toxic Elements Accumulation in Several Food Species Grown in Urban and Rural Gardens Subjected to Different Conditions
2021Sabina Rossini Oliva, Rafael López Núñez · Agronomy · Spain
This study investigated potential toxic element contamination in food and soils from urban and rural gardens in Seville, Spain, including urban gardens in a mining area. Soils from mining gardens were the most contaminated. While arsenic, cadmium, and lead concentrations in studied vegetables did not exceed legal maximum levels, high levels of barium (up to 42 mg kg−1) and zinc (up to 123 mg kg−1) were found in leafy green vegetables like chard and lettuce, indicating a need for further study on associated human health risks.
Contamination & food safetyHealthUrban–rural linkageHEAVY METALS IN FOOD CROPS: IDEAL SOURCES AND ROLES OF URBAN AGRICULTURE IN FACILITATING THEIR CONSUMPTION- A REVIEW
2021Nazir Muhammad Abdullahi, Ernest Chukwusoro IGWE, Munir Abba Dandago, Naima Umar · FUDMA Journal of Sciences · Global
This review discusses heavy metal contamination in food crops, identifying wastewater irrigation, agrochemical abuse, contaminated fields, atmospheric deposition, and unethical mining as primary sources. Agricultural soil in urban and peri-urban areas is heavily contaminated due to anthropogenic activities, with wastewater irrigation intensifying this contamination. Heavy metals are transferred to food crops during production and subsequently to humans upon consumption, posing a detrimental risk.
Contamination & food safetyHealthUrban–rural linkageChromium Laden Soil, Water, and Vegetables nearby Tanning Industries: Speciation and Spatial Distribution
2021Adugnaw Maru Gezahegn, Fekadu Fufa, Esayas Alemayehu, Abebe Beyene · Journal of Chemistry · Ethiopia (Modjo city)
This study investigated the spatial distribution and speciation of chromium in water, soil, and edible plants in tannery-contaminated areas of Modjo city, Ethiopia. Total chromium in the Modjo River was 20.6 mg L−1 upstream, and soil Cr (III) and Cr (VI) concentrations were found to be higher than guideline values. Chromium concentrations in edible plants were also significantly higher than in control areas, with roots accumulating more chromium than leaves and fruits. It was concluded that water, soil, and edible plants in this area contain chromium concentrations higher than recommended for a healthy environment and human consumption.
Contamination & food safetyHealthUrban–rural linkageProximity of Urban Farms to Hazards With and Without Heavy Metal Contamination in Baltimore, Maryland
2021Jonathan Hall, Isabel Shargo, Niya Khanjar, Jianna Howard, Laura Schmidt, Ashley Deng, Camryn Edwards, Isabelle Berman, Joseph Galarraga, Sacoby Wilson · Environmental Justice · United States
This study in Baltimore, Maryland, used GIS mapping and spatial analysis to assess the proximity of urban farms to environmental hazards, including those with heavy metal contamination. Analyses indicated that contamination of urban farms is a possibility due to proximity: more environmental hazards were found in census tracts with urban farms, and low-income communities of color had hazards near urban farms. Historically industrial areas showed a higher concentration of environmental hazards with heavy metal or unknown contamination.
Contamination & food safetyHealthCommunityUrban–rural linkagePolicyPolluted Waters Use in the Urban Agriculture and Its Impact on the Quality of the Grown Vegetables
2020Fabien Ilunga Mpanga, Michel Shengo Lutandula⃰ · The Global Environmental Engineers · Democratic Republic of Congo (Lubumbashi)
A study conducted in the Kasungami district of Lubumbashi, Democratic Republic of Congo, investigated the link between the use of polluted waters in urban agriculture and heavy metal contamination in soil and cultivated vegetables (amaranths, broccolis). Physicochemical and mineral analyses of water, soil, and plant samples revealed that heavy metals, except cobalt, were present in the water used for urban agriculture at concentrations below quality standards, but the soil contained heavy metals at phytotoxic concentrations. Only broccolis were contaminated with lead, while amaranths had heavy metals below quality standards. These findings suggest that urban agriculture in large agglomerations of the DRC could endanger consumers' health.
Contamination & food safetyHealthUrban–rural linkageПотенциални рискове от замърсяване на производството при земеделие в градска среда
2020Милена Йорданова, Вера Петрова, Цветелина Николова, Елена Цветкова, Milena Yordanova, Vera Petrova, Tsvetelina Nikolova, Elena Tsvetkova · Bulgarian Portal for Open Science · Global
This article considered the potential risks of contamination in urban agricultural products. Urban agriculture, particularly in large cities, areas with heavy traffic, or near industrial zones, can lead to the accumulation of heavy metals in vegetable crops due to air pollution, traffic pollution, and other sources. Consuming these contaminated fresh vegetables is noted to potentially deteriorate human health.
Contamination & food safetyHealthUrban–rural linkageAtmospheric sources of trace element contamination in cultivated urban areas: A review
2020Salvatore Engel‐Di Mauro · Journal of Environmental Quality · Global
This review examines atmospheric sources of trace element (TE) contamination in cultivated urban areas (CUAs), noting that these sources are understudied and poorly understood despite extensive research on TE contamination in CUAs. Existing research often assesses atmospheric deposition indirectly or lacks controls for other TE contaminants, and shows little engagement with atmospheric sciences methodological guidelines, which reduces confidence in current findings. The review suggests combining atmospheric science techniques with existing robust methodologies for TE contamination studies in CUAs.
Contamination & food safetyHealthUrban–rural linkageInfección por Angiostrongylus cantonensis (Nematoda: Metastrongylidae) en Rattus rattus (Rodentia: Muridae) en una localidad de La Habana, Cuba
2019Ariamys Companioni, Jennys Peraza, Zulema Menéndez Díaz, Aileen González, Ledy X López, Ana Elisa Rodriguez, Jorge Cantillo, Fidel Ángel Núñez · Dialnet (Universidad de la Rioja) · Cuba
A descriptive study in La Lisa Municipality, Havana, Cuba, examined 63 Rattus rattus rodents for Angiostrongylus cantonensis infection in an urban farm field. The study found that 46.03% of the captured rodents were infected with A. cantonensis, with infection rates increasing in adult individuals (59.46%) and during the rainy season (55.88%). This demonstrated the circulation of A. cantonensis in its definitive host in the area, indicating an increased risk of transmission to humans.
Contamination & food safetyHealthUrban–rural linkageRole of hand washing and water storage in copper tank on incidence of diarrhea
2019Mahantayya V Math, Yashoda R Kattimani, Manjusha M Padhye · Indian Journal of Community Medicine · India (Ahmadabad)
This study points out the impact of wastewater use in urban agriculture on the incidence of diarrhea in Ahmadabad, India. Vegetables grown with wastewater have an increased risk of internalization of food-borne bacteria such as E. coli and Salmonella into edible plant parts, posing a serious health risk. Contaminated water, soil, poor hand hygiene, and improper handling are sources of bacterial contamination for vegetables and fruits.
Contamination & food safetyHealthUrban–rural linkageHUBUNGAN ANTARA KUALITAS AIR DENGAN PREVALENSI ENDOPARASIT PADA SALURAN PENCERNAAN IKAN NILA (Oreochromis niloticus) DI KERAMBA JARING APUNG PROGRAM URBAN FARMING DI KOTA SURABAYA
2019Alfan Prianggara, Gunanti Mahasri, Abdul Manan · Journal of Aquaculture and Fish Health · Indonesia (Surabaya)
A survey in Surabaya, Indonesia, investigated water quality and endoparasite prevalence in Nile tilapia (Oreochromis niloticus) from urban farming floating cage programs. Water quality parameters were measured, and average endoparasite prevalence was 5.71% for Eimeria spp. and 8% for Acanthogyrus spp. The study found positive correlations between water clarity, ammonia, and DO with Eimeria spp. prevalence, and between temperature, pH, nitrate, and nitrite with Acanthogyrus spp. prevalence, indicating a link between water quality and parasite infection.
Contamination & food safetyHealthUrban–rural linkagePráticas agrícolas e análise socioeconômica e ambiental de canteiros urbanos: um estudo de caso dos horticultores do bairro Mangueira – Grajaú/MA
2018Jonas Aleixo da Silva · · Brazil
This qualitative case study analyzed urban agriculture practices in the Mangueira neighborhood, Grajau-MA, Brazil, through visits, observations, and interviews. The study found that while urban horticulture provided benefits like income and product quality, it faced difficulties including reliance on borrowed land, soil depletion, and the use of agrochemical products, indicating that production was not free from chemical fertilizers.
Contamination & food safetyCommunityEconomicsHealthWelfareUrban–rural linkageGeostatistical Analysis Of Contamination Of Soils In An Urban Area In Ghana
2018Simon Kojo Appiah, Eric Nimako Aidoo, Derrick Asamoah Owusu, M. W. Nuonabuor · Zenodo (CERN European Organization for Nuclear Research) · Ghana (Kumasi)
This paper assesses the spatial distribution of heavy metals and potential ingestion risks in Kumasi, Ghana, using geostatistical techniques on topsoil samples. Results from univariate and multivariate semivariogram models showed strong spatial dependence with autocorrelations ranging from 100 to 300 meters. The produced risk maps indicate strong spatial heterogeneity for most soil heavy metals, with extremely high contamination risk found near commercial areas.
Contamination & food safetyHealthUrban–rural linkageIdentifying the potential of some heavy metals toxicity in urban and peri-urban cropping systems in Sierra Leone
2017Abdul Rahman Conteh, Alusaine Edward Samura, E. L. S. Hinckley, Osman Nabay, Mohamed S. Kamara · Journal of Agricultural Science and Practice · Sierra Leone (Freetown)
This study was conducted to identify the risks of heavy metal contamination in urban and peri-urban cropping systems in Sierra Leone. Soil and plant samples were collected from 72 sites in Freetown and Bo and analyzed for Zn, Cu, Cr, Ni, Pb, and Cd. Heavy metals were detected across all sites, and some mild risk of cadmium toxicity was observed in densely populated areas of Freetown, though this was not reflected in plant uptake of cadmium.
Contamination & food safetyHealthUrban–rural linkageWelfare